/*  This program, server4.c, begins in similar vein to our last server,
    with the notable addition of an include for the signal.h header file.
    The variables and the procedure of creating and naming a socket are the same.  */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <netinet/in.h>
#include <signal.h>
#include <unistd.h>
#include <cstdio>
#include <cstdlib>
#include <pthread.h>

#include <string>
#include <sstream>

int clientID = 0 ;

class ClientSockFD
{
public:
	int sockfd ;
	std::string prompt ;
} ;

void * processClient ( void * pCSFD )
{
	
	ClientSockFD * pClientSockFD = reinterpret_cast<ClientSockFD *>(pCSFD) ;
	write(pClientSockFD->sockfd, pClientSockFD->prompt.c_str(), pClientSockFD->prompt.size()+1);
	close ( pClientSockFD->sockfd ) ;

	delete pClientSockFD;
}

	
int main()
{
    int server_sockfd, client_sockfd;
    int server_len, client_len;
    struct sockaddr_in server_address;
    struct sockaddr_in client_address;

    server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = htonl(INADDR_ANY);
    server_address.sin_port = htons(9734);
    server_len = sizeof(server_address);
    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

/*  Create a connection queue, ignore child exit details and wait for clients.  */

    listen(server_sockfd, 5);

    signal(SIGCHLD, SIG_IGN);

    while(1) {
        char ch;

        printf("server waiting\n");

/*  Accept connection.  */

        client_len = sizeof(client_address);
        client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address, (socklen_t *)&client_len);

		clientID++ ;

//Create a new thread to process this incoming client.
		pthread_t tid;
		ClientSockFD *pCSFD = new ClientSockFD() ;
		pCSFD->sockfd = client_sockfd ;
		
		pCSFD->prompt += "This is ";
		std::ostringstream oss ;
		oss<< clientID ;
		pCSFD->prompt += oss.str() ;
		pCSFD->prompt += "th Client.\n" ;
		
		pthread_create ( &tid, NULL, processClient, pCSFD ) ;
    }

	return 0 ;
}

